If one day, decades ago, a teenaged boy's co-worker and friend hadn't wanted to live like "normal" folks instead of scroungers, and shared a sushi dinner with his friend, Dennis Rodman probably wouldn't have ended up visiting the DPRK decades later, causing all the resulting foofaraw. But for that one little choice, a subsequent event that at least flashed across the awareness of most of the First World, and who knows how much of the rest of it, wouldn't have happened.
It's not necessarily something of geo-political consequence, but if that's not the notional "butterfly flapping its wings in China", I'm not sure what is.